With the topological degree , the fixed theorems for upper semicontinuous set - valued 1 - set - contractive mapping is studied.

研究了上半连续集值 1- 集压缩映射的不动点定理.

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Using topological degree the existence of anti - periodic solutions for third order differential systems is studied.

本文利用单调迭代方法讨论了一阶泛函微分方程 反 周期边值的存在性.

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